Contemporary Mobilization of Legacy Pb Stores by DOM in a Boreal Peatland

Environmental Science & Technology
Jeff D JeremiasonJames B Cotner

Abstract

We examined how different landscape areas in a catchment containing a northern ombrotrophic peatland and upland mineral soils responded to dramatic decreases in atmospheric deposition of lead (Pb). Pb concentrations in the outflow stream from the peatland measured from 2009-2015 indicated continued mobilization and export of Pb derived from historic inputs to the bog. In contrast, Pb concentrations in surface peat and runoff from upland mineral soils have declined in response to reductions in atmospheric deposition. Relative to the early 1980s, Pb concentrations in the streamflow decreased only ∼50%, while Pb in surface peat and upland subsurface runoff decreased by more than 90%. Water level fluctuations in the slow-accumulating peat have allowed dissolved organic matter (DOM) to continue mobilizing Pb deposited in the peatland decades earlier. Strong correlations between dissolved organic carbon (DOC) and Pb concentrations in outflow from the peatland and in bog porewaters demonstrate Pb mobility related to DOM production. Peat stores of Pb in 2016 were less than or equal to those reported in the early 1980s despite the dry mass inventory increasing by 60-80%. Much of the loss in Pb stored in peat can be accounted for by stre...Continue Reading

References

Feb 28, 2008·The Science of the Total Environment·Martin Novak, Petra Pacherova
Mar 21, 2008·Environmental Science & Technology·Carl P J MitchellRandall K Kolka
Jun 16, 2010·Environmental Science & Technology·H KempterW Shotyk
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Jun 5, 2013·Proceedings of the National Academy of Sciences of the United States of America·Thomas RiedelThorsten Dittmar
Feb 7, 2016·The Science of the Total Environment·Brian H HillRandall K Kolka

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